Lunch box



FIG. 1 is a perspective view of a lunch box showing my new design;

FIG. 2 is a perspective view thereof in an open position;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a right side elevation view thereof;

FIG. 7 is a rear elevation view thereof; and,

FIG. 8 is a bottom plan view thereof. 

The ornamental design for a lunch box, as shown and described. 